Hot joint paste



um'teo STATES PATENT OFFICE.

WILLIAM HOSKINS, OF CHICAGO, ILLINOIS,.ASSIGNOR "IO STANDARD OIL DEVELOP- ME'NT COMPANY, A CORPORATION OF DELAWARE.

, nor JOINT LPASTE. No Drawing. Application filed December 6, 1926. Seria1 No. 153,039.

This invention relates to a hot joint paste EwampZe II. for making tight joints between pipes an apparatus which are subjected to high temperatures.

a a The improved paste consists essentially of finely powdered graphite and the solid coir stituents of Waste liquors from the digestion A paste. composed of 50 parts of graphite and parts of sulfite liquor concentrate containing about 50% solids, mixed to a viscous or crearny paste.

In use,- the paste is applied to the parts to be 'oined so that it becomes distributel of Wood and the 1118.9 lor paper malnn For j J I L example, Waste sulfite liquors subjected to g lg 93 i fi or 9 mung 1o evaporation yield a solid concentrate or exi i g 'i l 1137 n tract, which is suitable for use in the ini- 00C y S 1 6 mt 6 nder the Proved pasta a partially evaporated action of the heat to which theJDlnt s exvvaste sulfite liquor containing about Water may he used. Similar substances may 35 be derived from Waste sulfate liquors and may be used in the production of the improved paste.

carbonized and, together with the graphite, give a tight joint. When it is desired to separate the parts, the. graphite serves as a lubricant, facilitating the rotation of screw The improved paste should contain suiiii i or other movemint F n the cient water so that it has the desired visumtmg sltrfaces' T 2 cons and adherent properties as will readily T P constlljuems 9 the P y be be understood by those'skilled in the art. mlxed m the 'el PF P n the The relative proportions of graphite, and necessary amounts of water fi to {911m the solid sulfite liquor constituents may vary h P st i about to u 1f Within Wide limits. In general, since Clam 1 graphite is the more expensive ingredient,

hot 19 E s l' fi plT l it is preferred to use more liquor extract g p sohds Tom Waste P p -me e than graphite, retaining, however, sufiicient q and Y P 7' graphite to serve as alubricantto facilitate h 3 p t material comprlsmg the separation of the parts joined together,- g pl nd 1 618 Irom Waste paper-mak- 30 when that is desired. The following con1- g q r:

positions are given as examples. 3. A hot joint paste consisting essentially E Z I of graphite, solids. of sulfite liquor and mam? Water.

A paste composed of 40 parts of graphite, 4:- A hot joint paste material comprising 35 60 parts of dry sulfite liquorextract, intigraphite, and solids from sulfite liquor.

'inately mixed with sufiicient water to give a viscous or creamy paste. WILLIAM HOSKI-NS.

posed the sulfite liquor constituents become 50 

